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Hard low-friction TiB(2)-based coatings incorporating C or MoS(2) have been synthesized by magnetron co-sputtering from TiB(2) and C or MoS(2) targets. The coating microstructure was characterized by glancing angle X-ray diffractometry and photoelectron spectroscopy. The friction coefficient was measured using pin-on-disk tribometry and hardness by nanoindentation. Our TiB(2)-C coatings were found to consist of two phases, diamond-like carbon (DLC) and a hexagonal TiB(2) type structure into which carbon is incorporated. A friction-reducing effect was observed only at C concentrations above 66%, where a significant quantity of DLC phase was able to form. For TiB(2)-MoS(2) coatings reduced friction was observed even at low concentrations of MoS(2). With both types of lubricants a trade-off between hardness and friction coefficient was found. Coatings exhibiting a relatively high hardness of 20 GPa and friction coefficients as low as 0.05 could be obtained by choosing a suitable composition. Low friction could be obtained for temperatures as high as 400 C for the TiB(2)-MoS(2) coatings, whilst the TiB(2)-C coatings exhibited a sharp increase in friction coefficient above 150 C.

Additional information

Authors: GILMORE R, JRC Ispra (IT);BAKER M, JRC Ispra (IT);GIBSON P N, JRC Ispra (IT);GISSLER W, JRC Ispra (IT)
Bibliographic Reference: Paper presented: International Conference on Metallic Coatings and Thin Films, San Diego (US) April 21-25, 1997
Availability: Available from (1) as Paper EN 40814 ORA
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